Martina Navratilova (Czech: Martina Navrátilová; born Martina Šubertová; October 18, 1956) is a retired Czech American tennis player an coach, an a umwhile Warld No. 1. Billie Jean King said aboot Navratilova in 2006, "She's the greatest singles, doubles an mixed doubles player that's iver livit."[1]